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Finding the Fourth Proportional to 617.39, 926.30 and 386.45

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Solution

The fourth proportional to 617.39, 926.30 and 386.45 is: 579.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.39 : 926.30 = 386.45 : x
  2. Step 2: Convert to fraction form
    617.39/926.30 = 386.45/x
  3. Step 3: Cross multiply
    617.39x = 926.30 × 386.45
  4. Step 4: Simplify right side
    617.39x = 357,968.64
  5. Step 5: Solve for x
    x = 357,968.64/617.39
  6. Step 6: Final answer
    x = 579.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.